如何在drawable中引用颜色属性? [英] How to reference colour attribute in drawable?

问题描述

我想做一个简单的事情:定义一个与系统状态按下背景颜色完全相同的可绘制对象.我在 res/drawables/my_drawable.xml 中这样做:

I would like to do a simple thing: Define a drawable which has exacly same background colour as system state-pressed background colour. I do it like this in res/drawables/my_drawable.xml:

<?xml version="1.0" encoding="utf-8"?>
  <selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_selected="true">
      <color android:color="?android:attr/colorPressedHighlight"/>
    </item>
    <item android:state_selected="false">
      <color android:color="@color/section_list_background"/>
    </item>    
  </selector>

我总是得到:

java.lang.UnsupportedOperationException: Cant convert to color: type=0x2

有什么线索吗?

问候

推荐答案

您可能需要执行以下操作来解决您的问题:

You might need to do the following to fix your problem:

1) 为颜色文件中的每个主题定义 2 种颜色:

1) Define 2 colors for each theme in your colors file:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="my_color_dark">#ff33B5E5</color>
    <color name="my_color_light">#ff355689</color>
</resources>

2) 使用内容创建文件 res/values/attrs.xml:

2) Create file res/values/attrs.xml with contents:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="my_color" format="reference" />
</resources>

3) 假设你的styles.xml中有2个主题(Theme.dark 和Theme.light)定义:

3) Assuming you have 2 themes in your styles.xml (Theme.dark and Theme.light) define:

<style name="Theme.dark" parent="@style/Theme.Sherlock">
    <item name="my_color">@color/my_color_dark</item>
</style>

<style name="Theme.light" parent="@style/Theme.Sherlock.Light">
    <item name="my_color">@color/my_color_light</item>
</style>

4) 在可绘制对象中使用颜色:

4) Use the color in a drawable:

<color android:color="?attr/my_color"/>

希望这能解决您的问题.

Hope this should fix your problem.

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